Vacuum suction structure of a mold

Abstract

The present application provides a kind of vacuum suction structure of mould, belong to mould technical field.It solves the problem of poor anti-trapped gas effect of existing vacuum suction structure.The vacuum suction structure of the present application, the mould includes fixed mould and movable mould, fixed mould and movable mould are enclosed to form cavity, movable mould and fixed mould are provided with parting surface, the present vacuum suction structure includes the air extraction channel being opened in fixed mould and the exhaust groove being opened in the parting surface of fixed mould and being annular, air extraction channel and cavity are communicated by exhaust groove, fixed mould and movable mould are provided with annular sealing ring between sealing ring and parting surface, sealing ring is located outside parting surface, fixed mould and movable mould form gas gap between sealing ring and parting surface, gas gap is communicated with air extraction channel.The vacuum suction structure of the present application is not affected when carrying out air extraction and cavity air extraction, so that the process of air extraction can be stably carried out, improve the stability of vacuum suction structure air suction.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to a vacuum suction structure of a mold. Background Art

[0002] Conventional plastic parts are typically manufactured by injecting molten plastic material into a molding cavity of an injection mold through the injection mold's gating system. After cooling and solidification, a plastic part having the same shape as the molding cavity is obtained. However, due to the small amount of air remaining in the mold cavity during the molding process, the plastic material is mixed with the residual air when injected into the molding cavity and remains in the plastic part, resulting in abnormal quality of the plastic part.

[0003] In response to the above-mentioned problems, researchers have developed a vacuum suction structure for the mold: for example, the Chinese patent application [Authorization Announcement No.: CN203061842U] discloses a vacuum injection mold, including an air pump, an air suction port, a cavity, a parting surface, an exhaust port, a mold body, an air sealing drum, an air suction groove, an air pump and an air charging port. The cavity is arranged inside the mold body, the parting surface is arranged below the mold body, the air sealing drum is arranged on the parting surface, the air suction groove is arranged on the parting surface, and is connected to the mold cavity through the exhaust port. The air suction port and the air charging port are respectively arranged on the air suction groove. The air pump is connected to the air suction port, and the air charging pump is connected to the air charging port.

[0004] The above structure is achieved by opening an exhaust groove on the parting surface, connecting the exhaust pump to the exhaust port, and the exhaust port is arranged on the exhaust groove, which can realize the exhaust of the air in the cavity and the mold. However, the mold body can be separated and the injection molded parts can be taken out. The connection between the fixed mold and the movable mold of the mold body is not completely sealed, which affects the overall vacuum exhaust effect in the mold body, resulting in poor effect of preventing air trapping in the mold. Summary of the Invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and propose a vacuum suction structure for a mold. The technical problem to be solved by the present invention is: how to solve the problem that the existing vacuum suction structure has a poor anti-air trapping effect.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A vacuum suction structure for a mold, the mold includes a fixed mold and a movable mold, the fixed mold and the movable mold together form a cavity, and both the movable mold and the fixed mold have a parting surface. The vacuum suction structure includes an exhaust channel opened in the fixed mold and an annular exhaust groove opened on the parting surface of the fixed mold, the exhaust channel and the cavity are connected through the exhaust groove, and is characterized in that an annular sealing ring is provided between the fixed mold and the movable mold, the sealing ring is located outside the parting surface, and the fixed mold and the movable mold form an air gap between the sealing ring and the parting surface, and the air gap is connected to the exhaust channel.

[0008] Working principle: After the fixed mold and the movable mold are closed, the external vacuum pump is connected to the air outlet of the vacuum channel and the vacuum channel is evacuated. At this time, the vacuum channel can extract the air remaining in the cavity through the exhaust groove. Due to the setting of the air gap, the sealing ring seals the cavity. At the same time, the air gap can, on the one hand, extract the gas in the air gap through the vacuum channel. On the other hand, when evacuating, the side of the sealing ring in contact with the air gap can be deformed under the influence of air pressure. The air gap has a giving effect, so that the sealing ring has a deformation space, thereby enhancing the sealing effect of the sealing ring on the cavity, preventing external gas from entering the cavity from the sealing ring, and thus improving the anti-trapped air effect. Moreover, since the air gap is set outside the cavity, the vacuuming of the air gap and the vacuuming of the cavity do not affect each other during evacuation, so that the vacuuming process can be carried out stably, thereby improving the vacuuming stability of the vacuum suction structure.

[0009] In the above-mentioned vacuum suction structure of the mold, the sealing ring is located above the parting surface, and the air outlet of the air suction channel is located above the sealing ring.

[0010] By setting the sealing ring above the parting surface, the sealing ring can not only play a sealing effect by itself, but also further improve the sealing effect of the sealing ring through the position setting. During injection molding, the temperature in the cavity is high, which leads to an increase in the temperature of the air in the cavity. The air outlet of the exhaust channel is set above the sealing ring, that is, above the parting surface. Following the principle that hot air goes up, the air in the cavity is easier to discharge, further improving the exhaust efficiency of the vacuum suction structure.

[0011] In the above-mentioned vacuum suction structure of the mold, the movable mold has a horizontally arranged sealing wall, a sealing groove is opened on the sealing wall, and the sealing ring has a mounting ring arranged in the sealing groove and a sealing sheet arranged on the sealing wall, and the sealing sheet is located on the outside of the sealing ring.

[0012] The installation of the sealing ring is achieved by embedding the mounting ring into the sealing groove, which has a positioning effect on the sealing ring during the mold opening and closing process. The setting of the sealing sheet enhances the contact area between the sealing ring and the fixed mold and the movable mold. The sealing sheet located on the outside of the mounting ring does not affect the deformation of the sealing ring during the suction process, thereby improving the sealing effect of the sealing ring.

[0013] In the above-mentioned vacuum suction structure of the mold, the sealing groove is a dovetail groove, and the outer wall of the mounting ring is in contact with the groove wall of the sealing groove.

[0014] The setting of the dovetail groove improves the stability of the sealing ring installation, and during the suction process, it also avoids the part of the sealing ring located in the dovetail groove from being sucked out, further improving the stability of the sealing ring setting.

[0015] In the vacuum suction structure of the above-mentioned mold, the fixed mold and the movable mold are both provided with guide walls inclined inward from top to bottom, a yield wall is provided between the guide wall of the movable mold and the parting surface of the movable mold, and a connecting wall is provided between the guide wall of the fixed mold and the parting surface of the fixed mold. The yield wall is an outwardly convex arc surface, and the connecting wall is a plane. A buffer cavity connected to the exhaust channel is formed between the yield wall and the connecting wall.

[0016] By setting the guide wall, the air in the air gap can be quickly introduced into the exhaust channel, and a buffer cavity is provided at the corner of the guide wall and the parting surface, so that the air sucked out of the air gap can be buffered at the corner and then sucked into the exhaust channel, thereby avoiding the air in the air gap interfering with the discharge of the air in the cavity.

[0017] In the vacuum suction structure of the above-mentioned mold, the exhaust channel includes channel 1 vertically passing through the fixed mold and channel 2 arranged horizontally. Channel 2 is connected to the middle part of channel 1, channel 1 is connected to the exhaust groove, and channel 2 is connected to the external exhaust fan.

[0018] Channel one vertically passes through the fixed mold, making it easier to form by opening an exhaust channel on the fixed mold. Since this structure not only exhausts the air in the mold cavity, but also exhausts the air in the air gap, the air flow is large during the suction process. Channel two is connected to the middle of channel one, so that the gas entering channel two can be buffered at the upper part of channel one, reducing the impact on the connection between channel two and channel one, so that the gas can be discharged stably, further improving the stability of the vacuum suction structure.

[0019] In the above-mentioned vacuum suction structure of the mold, a plurality of waist-shaped guide grooves are provided on the parting surface of the movable mold, part of the guide grooves is provided below the exhaust groove, and the other part is located between the exhaust groove and the cavity.

[0020] By setting the position of the guide groove, the air in the cavity can quickly enter the exhaust groove under the guidance of the guide groove, thereby achieving rapid exhaust of the air in the cavity and improving the exhaust efficiency.

[0021] The guide grooves are radially distributed along the circumference of the cavity.

[0022] In the above-mentioned vacuum suction structure of the mold, the movable mold is further provided with a plurality of overflow grooves connected to the mold cavity. The overflow grooves are in the shape of long strips, and one side of the overflow grooves is connected to one of the guide grooves.

[0023] The overflow groove is set to provide space for excess injection molding material in the mold cavity to flow out, and some gas may be brought out when the injection molding material flows out. By connecting one side of the overflow groove with one of the guide grooves, the gas in the overflow groove can be guided and discharged through the guide groove, thereby achieving stable exhaust.

[0024] In the above-mentioned vacuum suction structure of the mold, the groove depth of the overflow groove is greater than the groove depth of the guide groove, and the upper end of the overflow groove is connected to the guide groove.

[0025] By setting the depth of the overflow groove and the depth of the guide groove, the injection molding material in the overflow groove will not flow into the guide groove, and the gas brought out by the injection molding material will have a higher temperature and will move upward, directly connecting the upper end of the overflow groove with the guide groove, so that the gas can be discharged quickly.

[0026] In the vacuum suction structure of the above-mentioned mold, there are two cavities, and a drainage groove is provided on the parting surface of the movable mold. The drainage groove is arranged between the two cavities. The drainage groove includes two guide parts 1, one end of which is close to the cavity and one end of which is partially arranged in the exhaust groove. The other ends of the two guide parts 1 are connected and connected to the other end of the guide part 2. The guide part 2 is arranged between two adjacent guide grooves.

[0027] The drainage groove can cooperate with the guide groove to quickly discharge the gas in the cavity, and the setting of the guide part one allows the gas between the two cavities to be discharged through the guide part one. Converging the two guide parts one on one guide part two can improve the diversion effect while saving layout space, and further make the gas flowing into various parts of the exhaust groove more uniform, thereby improving the stability of the exhaust.

[0028] Compared with the existing technology, the vacuum suction structure of this mold has the following advantages:

[0029] 1. On the one hand, the gas in the gas gap can be extracted through the exhaust channel. On the other hand, when the gas is exhausted, the side of the sealing ring in contact with the gas gap can be deformed under the influence of air pressure. The gas gap plays a role of giving way, so that the sealing ring has deformation space, thereby enhancing the sealing effect of the sealing ring on the cavity, preventing external gas from entering the cavity through the sealing ring, and thus improving the anti-gas trapped effect.

[0030] 2. Channel 1 vertically penetrates the fixed mold, making it easier to open an exhaust channel on the fixed mold for molding. Since this structure not only exhausts the air in the mold cavity, but also exhausts the air in the air gap, the air flow is large during the suction process. Channel 2 is connected to the middle of channel 1, so that the gas entering channel 2 can be buffered at the upper part of channel 1, reducing the impact on the connection between channel 2 and channel 1, so that the gas can be discharged stably, further improving the stability of the vacuum suction structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is one of the cross-sectional views of the present invention.

[0032] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0033] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle.

[0034] Figure 4 This is the second cross-sectional view of the present invention.

[0035] Figure 5 yes Figure 4 A partial enlarged view of point C in the middle.

[0036] Figure 6 It is a bottom view of the fixed mold in the present invention.

[0037] Figure 7 It is a partial structural diagram of the present invention.

[0038] In the figure, 1. fixed mold; 11. exhaust channel; 11a. air outlet; 11b. channel 1; 11c. channel 2; 12. exhaust groove; 13. connecting wall; 2. movable mold; 21. sealing wall; 21a. sealing groove; 22. give way wall; 23. guide groove; 24. overflow groove; 25. drainage groove; 25a. guide part 1; 25b. guide part 2; 3. cavity; 4. parting surface; 5. sealing ring; 51. mounting ring; 52. sealing sheet; 6. air gap; 7. guide wall; 8. buffer cavity. DETAILED DESCRIPTION

[0039] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0040] like Figure 1 As shown, the vacuum suction structure of the mold includes a fixed mold 1 and a movable mold 2. The fixed mold 1 and the movable mold 2 together form a cavity 3. Both the movable mold 2 and the fixed mold 1 have a parting surface 4.

[0041] Specifically, if Figure 1-5 As shown, the vacuum suction structure includes an exhaust channel 11 opened in the fixed mold 1 and an annular exhaust groove 12 opened on the parting surface 4 of the fixed mold 1. The exhaust channel 11 and the cavity 3 are connected through the exhaust groove 12. An annular sealing ring 5 is arranged between the fixed mold 1 and the movable mold 2. The sealing ring 5 is located outside the parting surface 4, and the sealing ring 5 is located above the parting surface 4. The air outlet 11a of the exhaust channel 11 is located above the sealing ring 5. The fixed mold 1 and the movable mold 2 form an air gap 6 between the sealing ring 5 and the parting surface 4, and the air gap 6 is connected to the exhaust channel 11.

[0042] Working principle: After the fixed mold 1 and the movable mold 2 are closed, the external vacuum pump is connected to the air outlet 11a of the vacuum channel 11 and the vacuum channel 11 is evacuated. At this time, the vacuum channel 11 can extract the residual air in the cavity 3 through the exhaust groove 12. Due to the setting of the air gap 6, the sealing ring 5 can seal the cavity 3. At the same time, the air gap 6 can extract the gas in the air gap 6 through the vacuum channel 11. On the other hand, when evacuating, the side of the sealing ring 5 that contacts the air gap 6 can be compressed under the air pressure. Under the influence of , the air gap 6 produces deformation, and the air gap 6 has a giving effect, so that the sealing ring 5 has a deformation space, thereby enhancing the sealing effect of the sealing ring 5 on the cavity 3, preventing external gas from entering the cavity 3 through the sealing ring 5, and thus improving the anti-gas trapped effect. Moreover, since the air gap 6 is arranged outside the cavity 3, when vacuuming, the vacuuming of the air gap 6 and the vacuuming of the cavity 3 do not affect each other, thereby making the vacuuming process stable and improving the vacuuming stability of the vacuum suction structure.

[0043] like Figure 2 As shown, the movable mold 2 has a horizontally arranged sealing wall 21, a sealing groove 21a is opened on the sealing wall 21, the sealing ring 5 has a mounting ring 51 arranged in the sealing groove 21a and a sealing sheet 52 arranged on the sealing wall 21, the sealing sheet 52 is located on the outside of the sealing ring, the sealing groove 21a is a dovetail groove, and the outer wall of the mounting ring 51 is in contact with the groove wall of the sealing groove 21a.

[0044] like Figure 3As shown, both the fixed mold 1 and the movable mold 2 are provided with a guide wall 7 inclined inward from top to bottom, a clearance wall 22 is provided between the guide wall 7 of the movable mold 2 and the parting surface 4 of the movable mold 2, and a connecting wall 13 is provided between the guide wall 7 of the fixed mold 1 and the parting surface 4 of the fixed mold 1. The clearance wall 22 is an outwardly convex arc surface, and the connecting wall 13 is a plane. A buffer chamber 8 connected to the exhaust channel 11 is formed between the clearance wall 22 and the connecting wall 13.

[0045] like Figure 1-3 As shown, the exhaust channel 11 includes a channel 11b vertically passing through the fixed mold 1 and a channel 2 11c arranged horizontally. The channel 2 11c is connected to the middle part of the channel 1 11b, the channel 1 11b is connected to the exhaust groove 12, and the channel 2 11c is connected to the external exhaust fan.

[0046] like Figure 6 and Figure 7 As shown, a plurality of waist-shaped guide grooves 23 are provided on the parting surface 4 of the movable mold 2, part of the guide groove 23 is provided below the exhaust groove 12, and the other part is located between the exhaust groove 12 and the cavity 3, there are two cavities 3, and a drainage groove 25 is provided on the parting surface 4 of the movable mold 2, the drainage groove 25 is provided between the two cavities 3, the drainage groove 25 includes two guide portions 1 25a, one end of which is close to the cavity 3 and one end of which is partially provided in the exhaust groove 12. The other ends of the two guide portions 1 25a are connected and connected to the other end of the guide portion 2 25b, and the guide grooves 23 and the guide portion 1 25a are radially distributed along the circumference of the cavity 3.

[0047] By disposing the second guide portion 25 b , the second guide portion 25 b and the guide groove 23 are evenly distributed in the exhaust groove 12 , so that the gas discharged from each part of the exhaust groove 12 is more uniform, thereby improving the stability of exhaust.

[0048] like Figure 7 As shown, the movable mold 2 is also provided with a plurality of overflow grooves 24 connected to the cavity 3. The overflow grooves 24 are in a long strip shape. One side of the overflow groove 24 is connected to one of the guide grooves 23. The groove depth of the overflow groove 24 is greater than the groove depth of the guide groove 23. The upper end of the overflow groove 24 is connected to the guide groove 23.

[0049] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A vacuum suction structure of a mold, the mold comprising a fixed mold (1) and a movable mold (2), the fixed mold (1) and the movable mold (2) enclosing a mold cavity (3), the movable mold (2) and the fixed mold (1) both having a parting surface (4), the vacuum suction structure comprising an exhaust channel (11) provided in the fixed mold (1) and an annular exhaust groove (12) provided on the parting surface (4) of the fixed mold (1), the exhaust channel (11) and the mold cavity (3) being connected via the exhaust groove (12), characterized in that: An annular sealing ring (5) is provided between the fixed mold (1) and the movable mold (2), the sealing ring (5) being located outside the parting surface (4), and an air gap (6) being formed between the fixed mold (1) and the movable mold (2), the air gap (6) being communicated with the air extraction channel (11), the movable mold (2) having a horizontally arranged sealing wall (21), a sealing groove (21a) being provided on the sealing wall (21), the sealing ring (5) having a mounting ring (51) provided in the sealing groove (21a) and a sealing sheet (52) provided on the sealing wall (21). ), the sealing sheet (52) is located on the outside of the sealing ring, the fixed mold (1) and the movable mold (2) are both provided with a guide wall (7) inclined inward from top to bottom, a clearance wall (22) is provided between the guide wall (7) of the movable mold (2) and the parting surface (4) of the movable mold (2), a connecting wall (13) is provided between the guide wall (7) of the fixed mold (1) and the parting surface (4) of the fixed mold (1), the clearance wall (22) is an outwardly convex arc surface, the connecting wall (13) is a plane, and a buffer chamber (8) connected to the exhaust channel (11) is formed between the clearance wall (22) and the connecting wall (13).

2. The vacuum suction structure of the mold according to claim 1, characterized in that: The sealing ring (5) is located above the parting surface (4), and the air outlet (11a) of the air extraction channel (11) is located above the sealing ring (5).

3. The vacuum suction structure of the mold according to claim 1, characterized in that: The sealing groove (21a) is a dovetail groove, and the outer wall of the mounting ring (51) fits into the groove wall of the sealing groove (21a).

4. The vacuum suction structure of the mold according to claim 1 or 2, characterized in that: The exhaust channel (11) includes a channel 1 (11b) vertically penetrating the fixed mold (1) and a channel 2 (11c) arranged horizontally, wherein the channel 2 (11c) is connected to the middle of the channel 1 (11b), the channel 1 (11b) is connected to the exhaust groove (12), and the channel 2 (11c) is connected to an external exhaust fan.

5. The vacuum suction structure of the mold according to claim 1 or 2, characterized in that: A plurality of waist-shaped guide grooves (23) are provided on the parting surface (4) of the movable mold (2), wherein a portion of the guide grooves (23) is provided below the exhaust groove (12), and another portion is located between the exhaust groove (12) and the mold cavity (3).

6. The vacuum suction structure of the mold according to claim 5, characterized in that: The movable mold (2) is also provided with a plurality of overflow grooves (24) connected to the mold cavity (3). The overflow grooves (24) are in a long strip shape, and one side of the overflow groove (24) is connected to one of the guide grooves (23).

7. The vacuum suction structure of the mold according to claim 6, characterized in that: The overflow groove (24) has a groove depth greater than that of the guide groove (23), and the upper end of the overflow groove (24) is connected to the guide groove (23).

8. The vacuum suction structure of the mold according to claim 5, characterized in that: There are two mold cavities (3), and a drainage groove (25) is provided on the parting surface (4) of the movable mold (2). The drainage groove (25) is arranged between the two mold cavities (3). The drainage groove (25) includes two drainage parts (25a) with one end both arranged close to the mold cavity (3) and a drainage part (25b) with one end partially arranged in the exhaust groove (12). The other ends of the two drainage parts (25a) are connected and connected to the other end of the drainage part (25b). The drainage part (25b) is arranged between two adjacent guide grooves (23).

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